我国东部山地针阔混交林碳通量特征分析

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Abstract This study explored the carbon sink capacity of the complex mountainous forest ecosystem around the Damaojian Mountain in Wuyi County, Jinhua, Zhejiang Province. Utilizing the eddy covariance method, CO₂ fluxes were monitored from June 2022 through May 2023. After rigorous data quality control and analysis, 42% of the data were identified as high-quality CO₂ flux measurements. The study draws the following conclusions: This area, primarily composed of mixed coniferous and broad-leaved forests with an energy closure rate of 0.89, effectively represents the flux conditions of the site. The CO₂ flux exhibited a U-shaped daily variation, with fluctuations ranging from -1.20 to 0.89mg CO₂/(m²·s). An analysis of the seasonal carbon sink capacity revealed the strongest absorption in summer, followed by spring, autumn, and winter, with the net ecosystem carbon exchange (NEE) demonstrating a consistent carbon sink effect month-over-month. The analysis highlighted a negative correlation between CO₂ flux and air temperature, whereas both relative humidity and average wind speed positively influenced the CO₂ flux. Nighttime respiration-induced CO₂ flux also showed a positive correlation with soil temperature. Overall, we have preliminarily explained the unique carbon sink features of the Damaojian Mountain forest ecosystem.

Key words： CO₂ flux eddy covariance net ecosystem carbon exchange forest ecosystem complex terrain

Received: 13 November 2023

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	Articles by authors
	SUN Yan-kun
	ZHANG Yin-zhou
	YAO Wei-jie
	YE jing
	ZHANG Jun-bo
	PAN Xiao-le
	LIU Lan-zhong
	WANG Zi-fa
	CHENG Xue-ling

Cite this article:

SUN Yan-kun,ZHANG Yin-zhou,YAO Wei-jie等. Characteristics of carbon flux in mixed coniferous and broad-leaved forests in the mountainous areas of Eastern China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3492-3501.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I6/3492

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